package com.zdw.test5.utils;

import org.apache.commons.dbcp.BasicDataSource;
import org.apache.commons.dbcp.BasicDataSourceFactory;

import javax.sql.DataSource;
import java.io.InputStream;
import java.sql.*;
import java.util.Properties;

/**
 * Author: Zhang Dongwei
 * Date: 2022/4/3 18:59
 */
public class JdbcUtils_DBCP {

    private static DataSource dataSource = null;

    static {
        try{
            InputStream in = JdbcUtils_DBCP.class.getClassLoader().getResourceAsStream("dbcpconfig.properties");
            Properties properties = new Properties();
            properties.load(in);
            // 创建数据源 工厂模式--》创建对象
            dataSource = BasicDataSourceFactory.createDataSource(properties);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    //2.获取连接
    public static Connection getConnection() throws Exception{
        return dataSource.getConnection(); // 从数据源中获取连接
    }
    //3.释放资源
    public static void release(Connection conn, Statement st, ResultSet rs){
        if(rs!=null){
            try {
                rs.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }

        if(st!=null){
            try {
                st.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if(conn!=null){
            try {
                conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
}